The Eurorack bus carries internal CV and Gate lines that can replace front-panel patch cables for common signals

Beyond power, the Doepfer A-100 system bus includes two signal lines: INT.CV and INT.GATE. These allow a single MIDI-to-CV interface or bus access module to broadcast pitch and gate to multiple oscillators and envelope generators without front-panel patch cables. Only one transmitter may drive each line at a time; multiple receivers are fine. Modules opt in via jumper settings. The bus lines can be split at mid-board jumpers (J1/J2) to create two independent CV/Gate zones on one row, or linked across rows with A-100BC cables. This is an optional convenience — all connections can also be made via front-panel jacks.

Examples

A keyboard controller’s MIDI-to-CV interface broadcasts pitch CV on the bus. Three VCOs each have their jumper set to receive INT.CV, so all three track the keyboard without three separate patch cables.

Assessment

You add a second MIDI interface to a system that already has one transmitting CV on the bus. What risk does this create, and how do you avoid it? How would you create two independent pitch zones on a single bus row?